The men’s singles semifinals are on Friday in New York, as is the championship match in women’s doubles.

Three years ago, in the US Open quarterfinals, Ben Shelton and Frances Tiafoe played for the first time. Ranked in the top 10, Tiafoe was the older and more established player, yet it was 47th-ranked Shelton who prevailed in four sets. Following that match, a dejected Tiafoe would fall into a huge slump, losing 13 of his next 22 matches. However, Tiafoe would slowly rebuild his confidence, and a year later at this same event, he would avenge that painful loss to Shelton with a five-set win of his own. In Friday’s semifinals, we get the US Open rubber match, as both men look to achieve the first Major final of their career.

Earlier in the day, the other men’s semifinal sees top-seeded Alexander Zverev vie for his third Major final in a row, against three-time Major semifinalist Karen Khachanov.

And prior to that, the women’s doubles championship will be decided.

Here’s a rundown of the most notable matches on Day 13 (in chronological order, all times local):

Katerina Siniakova and Taylor Townsend vs. Ashlyn Krueger and Robin Montgomery (WC) – 12:00pm on Arthur Ashe Stadium

Siniakova is playing for her 12 Major in women’s doubles, and her fourth with Townsend. A victory would give Townsend a career Slam in women’s doubles. Siniakova and Townsend lost in the final here a year ago, to Gabriela Dabrowski and Erin Routliffe.

Krueger and Montgomery are a huge surprise in this final, as the American wild cards are not a regular team, though they did win the US Open girls’ doubles title five years ago. They decided to reunite for this fortnight, and have advanced all the way to the final, thanks to a huge comeback from 8-2 down in the third-set tiebreak against the second seeds, Gabriela Dabrowski and Luisa Stefani. Can they pull off another huge upset, and become US Open champions in the women’s event?

Alexander Zverev (1) vs. Karen Khachanov – Not Before 3:00pm on Arthur Ashe Stadium

For the third straight Major, the draw has completely opened up for Zverev, and he has taken full advantage. The German leads the ATP with 51 wins on the year, and after some subpar tennis resulted in five-setters in the first two rounds, he’s won the last three rounds in straights. But as mentioned, Zverev is yet to face a top 20 player, and now he faces the 50th-ranked player, who has struggled throughout the season.

However, this is far from uncharted territory for Khachanov, who was a semifinalist here four years ago, as well as at the following Major in Melbourne. And despite his recent struggles, he’s found his best level in quite some time during this tournament, with victories over third-seeded Auger-Aliassime and 14th-seeded Learner Tien. Khachanov benefitted from a mid-match retirement via an injured Alexander Blockx in the quarterfinals, so like Zverev, Khachanov should be fully fresh for this semifinal.

Zverev is 6-3 against Khachanov, in a head-to-head that spans a full 10 years. Eight of those nine matches have taken place on hard courts, and Zverev has claimed four of the last five. The No.1 seed’s serve will be the biggest weapon on the court, and there’s not much in Khachanov’s game that should threaten Zverev, who must be considered the clear favorite. However, the only factor that could truly trouble Zverev is this: as per his request, all five of his previous matches took place at night. Playing during the day on Ashe provides different conditions, lighting, and sight lines. It also requires a very different preparation schedule, and Zverev reportedly prefers playing and practicing at night. So I’m curious to see if a daytime match hampers Zverev’s play in this semifinal.

Frances Tiafoe (11) vs. Ben Shelton (8) – Not Before 7:00pm on Arthur Ashe Stadium

Unlike the first semifinal, neither of these men come into this match fully fresh. While both thankfully had two days off, both played five-setters in the quarterfinals. Tiafoe came back from two-sets-to-love down against an inexperienced fellow American Alex Michelsen, who frankly choked when trying to serve out the match in the third set. And Shelton overcame defending champion Carlos Alcaraz in an epic five setter that lasted all the way until 3:33am.

Outside of their aforementioned meetings at this event, Tiafoe and Shelton have played twice, with Shelton taking both encounters: one on clay, and one on a hard court. They own very similar records this season (Shelton is 38-13, Tiafoe is 42-16), and this is a third Major semifinal for both.

Shelton has the edge in power, while Tiafoe has the edge in speed and finesse. But to me, the biggest difference between the two to me is how they carry themselves: Shelton is more of a big-match player, and exudes more self-belief. However, how much Ben can recover from such a physically and emotionally draining quarterfinal, that started and ended at such an absurd time of day? With two days to regroup, I still give Shelton the slight edge on Friday night.

Friday’s full Order of Play is here.